PHP implements IP address conversion to integer numeric instance _php tutorial

IP address translation in the integer data and then saved to the database, this is a common practice, we convert the IP algorithm is Intip = 256*256*256*w + 256*256*x + 256*y + Z can be, the following to give you students to introduce specific examples.

"Principle of conversion": Assuming that IP is: w.x.y.z, the IP address to integer number is calculated as: Intip = 256*256*256*w + 256*256*x + 256*y + Z

"PHP Mutual transfer": Php conversion method is relatively simple, it built up two functions

int Ip2long (String $ip _address)//IP converted to integral type value
string Long2ip (String $proper _address)//integer value converted to IP "MySQL cross-turn": Compared to MSSQL, MySQL is a simpler way to convert, and it has two functions built into PHP as well.

IP to Integer type:

Select Inet_aton (IP address) integer value converted to IP

Select Inet_ntoa (integer value for IP)

An instance

1. Manual implementation of their own methods

function Ip2number ($IP)      {          $t = explode ('. ', $ip);          $x = 0;          for ($i = 0; $i < 4; $i + +)          {              $x = $x * + $t [$i];          }          return $x;      } function Number2ip ($num)      {          $t = $num;          $a = array ();          for ($i = 0; $i < 4; $i + +)          {              $x = $t%;              if ($x < 0) $x + =;              Array_unshift ($a, $x);              $t = Intval ($t/256);          }          Return implode ('. ', $a); }

http://www.bkjia.com/PHPjc/631516.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/631516. Htmltecharticleip address translation in the integer data is then saved to the database, this is a common practice, we convert the IP algorithm is Intip = 256*256*256*w + 256*256*x + 256*y + z can, the following to each ...

